Before you go for Sint Marteen, there are a few things you should be aware of in order to avoid surprises along the route. Because we're talking about two distinct nations, each region of the island has its own distinct characteristics.
The first thing you should be concerned about is the visa requirements. In the instance of Sint Marteen, you should look into the Kingdom of the Netherlands' Caribbean visa policy. Because the policy is not stringent, you are unlikely to require a visa to visit Sint Marteen. This is due to the policy's inclusion of a list of visa-exempt nations, whose people may enter and remain in Sint Marteen for up to 90 days without a visa. The same nations are permitted entry into Aruba, Curacao, and the Caribbean Netherlands. If your place of origin is not on the list of visa waiver nations, you may apply for a visa at the closest Dutch embassy. The procedure is not as difficult as you believe, and you just have to wait a few days for the paperwork to come.
In terms of the visa, two points need to be addressed. The Netherlands is a member of the Schengen Area Agreement, but Sint Marteen is not, hence a Schengen visa cannot be used to enter Sint Marteen. The second point to note is that a visa that allows you to enter Sint Marteen will not allow you to enter the European Netherlands. You should never mix the two.